Changing Seas"No Fish Left Uncounted"
How do you count two fish, three fish or even a school of fish? In Dry Tortugas National Park, located 70 miles from Key West, Florida, a group of scientists have joined forces to conduct a massive fish census. In this unprecedented collaboration, experts from four different agencies unite to count and analyze fish data from select sites. Changing Seas follows highly-skilled science divers as they determine the size of fish populations in hopes of better understanding how fishing pressures and environmental changes affect populations of marine resources within the park. D

5:30 pm

Changing Seas"Sentinels of the Seas"
Bottlenose dolphins are a beloved Florida icon. But, recent studies show disturbing signs of immune system dysfunction and disease plaguing this charismatic mammal. These problems might be linked to legacy contaminants and other pollutants which bio-accumulate up the ocean food chain. D

6:00 pm

Changing Seas"Seagrasses and Mangroves"
They are an ancient species of flowering plants that grow submerged in all of the world's oceans. Seagrasses link offshore coral reefs with coastal mangrove forests. Today, these "prairies of the sea," along with mangroves, are on the decline globally. D

6:30 pm

Changing Seas"Sinking The Vandenberg"
In the turquoise blue waters of the Florida Keys, a new attraction is drawing scuba divers from around the world: The USNS General Hoyt S. Vandenberg. Laid to rest in the Florida Keys National Marine Sanctuary, the Vandenberg is the world's second largest intentionally sunk shipwreck. In her last mission as an artificial reef, this massive ship is already attracting a variety of fish and other marine life. D

7:00 pm

Nature"Moment of Impact: Hunters & Herds"
Wildebeest, built like marathon runners, are up against lions, born sprinters; the chance of being lunch lessens if the wildebeest maintain a 50-yard safety zone when lions are near. California ground squirrels increase heat profiles by flicking tails, which confuses rattlesnakes that hunt using heat-detecting organs. Part 1 of 2G

Nightly Business Report
With Europe's economy in turmoil and talk of another U.S. recession, what's next for America's economy? Election 2012: Jobs and the economy are two of the top topics on the minds of voters. Tonight we start our coverage of the issues that are driving Americans to head to the polls. D

Changing Seas"Seagrasses and Mangroves"
They are an ancient species of flowering plants that grow submerged in all of the world's oceans. Seagrasses link offshore coral reefs with coastal mangrove forests. Today, these "prairies of the sea," along with mangroves, are on the decline globally. D

11:30 pm

Changing Seas"Sinking The Vandenberg"
In the turquoise blue waters of the Florida Keys, a new attraction is drawing scuba divers from around the world: The USNS General Hoyt S. Vandenberg. Laid to rest in the Florida Keys National Marine Sanctuary, the Vandenberg is the world's second largest intentionally sunk shipwreck. In her last mission as an artificial reef, this massive ship is already attracting a variety of fish and other marine life. D